Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
1,720
questions
2
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0answers
14 views
Should I open my AC register in the basement to help with condensation?
Really hot in NJ this week, excessive heat warnings, and the like.
Daytime Temp: 96 degrees
Daytime Humidity: 55%
Feels Like: 105 degrees
Nighttime Temp: 79 degrees
Nighttime Humidity: 87% ...
2
votes
0answers
13 views
Trane HVAC in horizontal position - why does evaporator throw condensation?
I appreciate assistance from anyone who has had or understands the problem.
I have a Trane HVAC system in a horizontal "left" flow configuration in the attic. Ambient temperature is about 95 ...
0
votes
0answers
10 views
Installing Nest Thermostat. C Wire not hooked up inside furnace
Good morning. I am looking to hook up a Nest 3rd Gen thermostat that I purchased. I noticed I had a C wire upon pulling the old thermostat. Problem is it is not connected inside of the furnace. I have ...
0
votes
2answers
18 views
Thinnest screed over the water heating floor
I installed a water heating floor system with 17 mm pipes and studded panels.
This is how a studded panel with a pipe looks like:
It has 52 mm height (the polystyrene has 30 mm).
Now I want to add ...
0
votes
0answers
11 views
Low air flow from the 2nd floor bathroom register and I can't find where it connects to the main air supply duct
My air supply system is very straightforward, with an extended plenum in the basement ceiling with 13 branch ducts. But, the house has 14 registers. There are 5 registers on the second floor but only ...
0
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0answers
17 views
Condo fan coil thermostat fan never turns off, cooling is humid
My thermostat in my condo is a honeywell thermostat and it the only options it has are System and Fan. Fan is set to auto (other option is Lo Med Hi) and the System is set to Cool (or Auto or Off). ...
0
votes
1answer
31 views
External Air Conditioner Condenser Capacitor replacement
I have a couple of questions about testing and replacing the capacitor on my home heat pump external condenser unit.
1. How can I reliably test the capacitor (what tools do I need?)
2. What safety ...
0
votes
0answers
22 views
A/C capacitor replacement
Can a CBB65 55+15uF+/-5% 250VAC 40/70/21 dual capacitor in a window mounted a/c unit be replaced with a 50+15uF +/-5% 250 VAC 40/70/21 safely?
2
votes
1answer
28 views
Can I pull a common wire off an evaporative cooler transformer relay?
I have a Nest thermostat currently controlling a LP furnace. The old thermostat didn't have a common wire connected, but there was a an extra wire in the bundle and a common terminal on the furnace ...
0
votes
1answer
42 views
Is it more efficient to turn my AC unit off periodically vs. keeping it on only while in the room?
I have an AC unit in my bedroom + workspace. I use its "auto" fan speed and
"energy saver" mode (rather than "cool" or "fan only"). I'm wondering, which strategy is more energy efficient and by ...
0
votes
0answers
14 views
water in insulation boards - best method to dry out
I have a horizontal flow brand-new HVAC unit, with a 1" thick insulation board plenum which has had some water ingestion on the bottom panel. The unit is in the attic.
I'm quite confident the water ...
1
vote
1answer
25 views
HVAC Air Blowback
Furnace/Blower: Rheem R92PA0851521MSA
Dual Zone System (Honeywell TrueZONE HZ311)
- Honeywell M847D1004 Actuators
Age of system: less than 2 years old including ductwork
Ive noticed that if Zone 1 ...
0
votes
1answer
31 views
Could my furnace be leaking due to condensation neutralizer?
I posted this and the main suspect was condensation pump but after troubleshooting, the pump is working fine (tested standalone). Now I wonder if the leak could be due to the condensation neutralizer; ...
0
votes
0answers
20 views
HVAC Second Floor Poor AC/Heat
I have one middle bedroom second floor that virtually gets no forced air AC or heat. Placing you hand on the reister you don't feel no force, very little air push. I on more than one occasion have ...
1
vote
1answer
82 views
Mysterious Metal Plate on Basement Ceiling?
There is a metal plate on the top of my basement's celing.
It is attached to the HVAC ducts, but doesn't appear to be a duct itself.
I'm interested in using the stud it is attached to hang an LED ...
0
votes
1answer
87 views
Is my furnace leaking water?
I have water accumulated in my basement, that I squeezed out using towel. It was about 8 gallons of water in all. The only source I can see is the furnace whose surrounding is wet but I have never ...
1
vote
1answer
30 views
A/C Fan won't turn on outside after replacing capacitor
I know this is a DIY stack exchange, and to be forthright, I did not DIY this initial repair because I was intimidated by replacing a capacitor, so I called a recommended technician who did the job ...
1
vote
2answers
67 views
Central AC Unit - Intake is very cold
So my central AC unit started doing something that I have not experienced before.
Once the AC stops, cold air comes out of the intake vent, like really cold air. This has lead to ice forming on the ...
0
votes
0answers
47 views
Air conditioner unit wires
I was trying to weather proof yesterday and my unit fell out of the window. I grabbed the cord and yanked out some of the wiring on accident. Can someone help me figure out how to reattach?
1
vote
1answer
43 views
Why the noises in the new furnace?
A company installed a new HVAC system 2 weeks ago. The furnace model was new: 58TNOA110C21–20. I initially ordered 58CVA110-20 but they said it will be out of market soon in August. So they installed ...
2
votes
1answer
77 views
Competing conditioned/combustion air flow; worry about CO?
My home has a partially-below grade basement that has a "Wave" ventilation system that brings cool, conditioned air in from the main house. The basement has an equipment room containing an oil burning ...
1
vote
0answers
73 views
The new AC doesn't cool the house down like old unit, what can be the problem?
I had to replace my old HVAC because it was old and had a freon leak. The new unit doesn't cool down the house like the old system. The ac runs all day and it takes hours to get down to 72 degrees and ...
0
votes
1answer
27 views
How to retrofit existing kitchen exhaust fan
I'm remodeling a kitchen that is circa 1940's. In the kitchen is an exhaust fan that sits inside a 3.25x10 duct. I would like to keep an exhaust fan in this location and re-use the existing duct, ...
0
votes
0answers
18 views
Spacing between supply line/cold air return
Is there a minimum spacing that should be followed when installing a new supply line into a room? I'm remodeling my basement and have two supply vents in the ceiling, but wanted to add 1 or 2 near ...
2
votes
1answer
38 views
Another “How do I add ”c" wire to boiler for Nest
I have tried searching this forum and others, but I could not find anyone with a situation like mine. I thought it better to ask here, rather than damage something.
I have a Lennox wall mounted ...
1
vote
1answer
18 views
3-zone HVAC (HZ432) one zone's a/c stops working when hot in afternoon
I have a 3-zone HVAC. All 3 zones a/c worked fine until recently. Now, in the morning, before it gets too hot, all zones still work fine. But in the afternoon, when it gets hot, the a/c to zone 2 ...
0
votes
1answer
49 views
New HVAC installed [closed]
I just had a new HVAC system installed and the contractor installed in on a pounding raining stormy day. I am thinking that was a bad decision on his part. Now my home has a musty smell and air ...
0
votes
0answers
26 views
Door to AC unit causing pressure change?
Found water in the bottom of my AC unit inside. When I remove the bottom door the water will run back to the drain. But when I put the door back on, the water is being sucked down by the motor. There ...
1
vote
0answers
31 views
Furnace blower cutting in and out during A/C use
Backstory:
I fired up my air condition for the first time this season (single family house) and felt lukewarm air coming out of my ducts. When i went outside i saw that the condenser was not turning ...
1
vote
1answer
31 views
Running AC/Heater when washing a cleanable filter
I have a heat pump/AC system with a washable air filter. I was told to clean the filter out and run water through it once a month.
He told me to let the filter dry for 3 hours before replacing it. I ...
0
votes
0answers
9 views
Hvac condensate line not draining, New ac system
Hi so I just purchased a house. It was a bank foreclosure. The bank installed a new ac unit. The ac wasn't running in day one. I figured out it was bc the condensate line wasn't draining properly. The ...
4
votes
3answers
146 views
Is there such a thing as a DIY heat pump or mini split
I wanted to ask this question to the community.
Is there a legal way to install a mini split or heat pump without having an EPA license? I have seen similar questions asked several times or ...
1
vote
1answer
31 views
What's the easiest way to trace out existing HVAC ductwork without cutting into the walls
I recently bought a multi-story house with a 4 zone HVAC and only one of the zones works (it just heats/cools the entire house as one zone, and the one working zone is for a small foyer which is ...
0
votes
1answer
20 views
Window air condition location placement question
1800 sqft + basement
On main floor
2 window air conditioners 19k btu combined
Upstairs
1 5k btu air condition
There is 3 bedrooms upstairs, does it make sense to jist pit all the ac units upstairs ...
0
votes
0answers
48 views
HVAC Exhaust Routing Question
Just wondering if I could get some advice on the optimal way to route the HVAC Exhaust piping. Enbridge replaced the supports underground and before they turned the gas back on they did an inspection ...
1
vote
0answers
25 views
Separate Thermostats for Heating and A/C
I recently purchased a vacation home that has two thermostats for a forced hot air gas furnace and a separate A/C unit that shares ductwork. The A/C also cools better when both the A/C and furnace fan ...
1
vote
0answers
46 views
Does cabling between a mini-split indoor and outdoor unit need conduit?
I am installing a mini-split AC system where there are multiple indoor units connected to a single outdoor unit. For each indoor unit, there is a separate 4-conductor cable that connects to the ...
1
vote
1answer
38 views
AC Condensate Line Location - Outside vs Inside
I'm installing a few mini-split AC units in my house, and I'm trying to determine the best place to run the condensate line. Right now it's either between running it outside with the line set and tray ...
0
votes
2answers
53 views
Why would my HVAC blower motor stop working after 10 minutes of runtime
my 2 year old unit it freezing after it’s been running about 10 minutes. I turned the unit off all last night. This morning I took a look at it outside, then went back in, turned it on, sat by the ...
0
votes
1answer
28 views
Can the wire from the y terminal on thermostat be connected to the c terminal on heater board as pictures show?
My nest was installed with no c wire and it lost power. At this point the tech looked at the wiring diagram in a/c unit outside but I do not know what he did. A/c worked but later nest had no power. I ...
1
vote
1answer
35 views
Install a Wi Fi thermostat
Trying to install a WiFi thermostat. I have the unused blue wire which I believe is the common wire. It is unused both and the furnace level as well as on my current thermostat. However there is ...
0
votes
0answers
23 views
Installed NEST thermostat heat works fine, AC compressor comes on but no fan on AC unit
I installed a new NEST thermostat last fall so only used it for heat so far. When I went to turn on AC, compressor came on but AC unit fan didn't. AC worked fine last year. Could this be a NEST ...
0
votes
2answers
98 views
Can I put a 20Amp breaker on a 55 amp line for an A/C unit?
I have an unused 3 wire 220V 55 amp circuit from the meter from my old A/C unit running right where I need a 20 amp 3 wire 220v, is there a way to reduce the circuit, put in a remote 20 amp breaker ...
1
vote
0answers
37 views
Dedicated 240v 30A Circuit Switched for A/C and NEMA 14-30 [duplicate]
I have a dedicated 240 volt circuit that's hard wired into my air conditioning unit. The circuit has a 30 amp breaker at the main box and another 30 amp breaker on the wall next to my air conditioner....
2
votes
1answer
21 views
How do I determine where to connect a new C wire inside my furnace when no control panel or wiring terminal exists?
I am replacing my existing thermostat with a new smart thermostat that requires a C wire connection and the old unit did not. I intended to utilize the unused Blue wire which is not connected on ...
0
votes
0answers
39 views
air handler not turning on
Assume an ac compressor doesn't work. Will the air handler still come on if the thermostat is set to fan "on"? Does this differ system to system?
I am trying to troubleshoot a non-responsive ac ...
1
vote
2answers
101 views
How do I deaden the sound of water dripping on metal?
I live in a two story apartment complex (upstairs neighbors are REAL nice). My bedroom has an AC Box/Swamp Cooler mounted into the wall. Directly above it is a similar unit for my neighbors.
The ...
1
vote
1answer
83 views
Best air conditioner for cold blasts?
The old air conditioners I had could blow out snow literally that is how cold they got, now air conditions are only moderately cold. What would be the best system to get to just blast one giant vent ...
0
votes
1answer
51 views
Why is my AC only blowing out Ice cold air and freezing over AC lines?
I've had a company come out and tell me the ac and furnace are ran from 2 different fans and they recharged the AC unit. However, prior to this the AC was still freezing over the lines. If I have the ...
0
votes
0answers
45 views
Wand or 2 foot long stick between my master bath fan and outdoor flood lights connecting to share wiring for power?
I'm divorced. My ex husband had a guy install a junction box on corner of house to spotlight the swing set years ago. Recently I was in the attic and discoved a 2 ft "stick' or "wand' that was quite ...
